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李允洙,秦元宰 서울産業大學校 1990 논문집 Vol.32 No.1
From early times, when the ancestors of mankind drawed a wall painting in a cave, the visual communication has being existed as a fundamental deed of man activity. Through the visual communication, mankind could invent a letter and establish, maintain the culture. Especially, graphic symbol has played a role as a important means while differing the form and the use according to the change of times. In these days, namely the present age which the world changes into the one global village and the age of remarkable technological innovation, the use of graphic symbol will be expanded more and more to contrive a convenience of the masses, to bridge a wide gap between the new progress of mechanical technique and a letter, language. But the understanding of people as to the role of graphic symbol is still insufficient in our country. Moreover, the interest of the government authorities of other academic circles is scarce. What is worse, graphic symbol is treated to be a simple pictorial design as one branch of Applied Arts according to some circumstances. But as emphasized many times in this research, graphic symbol is a great inheritance of mankind which make a lot of contribution for a development of culture, have a eternal history. Therefore, on a viewpoint that the design level of one country is in proportion to the cultural level of that country, we will have make an effort to use the graphic symbol more properly and effectively. As well, in view of foreign present situation that the study organization of graphic symbol is being established and the researches are being progressed actively, our country which greet the international age will have to make the change of thought and improvement.
Fluent를 이용한 고속전철주위의 수치해석적 유동연구
李鳳來,진원재 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-
The aerodynamic charateristics of high speed train can be improved by fore-body design. In this paper, the design a fore-body shape which has optimal aerodynamic charateristics, 9 models of fore-body shape are proposed and the change of aerodynamic charateristics is studied through calculations of flow field around high speed train for each fore-body shape. The flow field around high speed trains are calculated using Navier-Stokes equation. The variational trends of aerodynamic charateristics are studied from the result of flow calculations around high speed trains for 9 fore-body shapes. and The three-dimensional unsteady compressible Navier-Stokes equation solver with sliding moving mesh method has been applied to analysis the flow field around the high speed train which is entering into tunnel. From the present study, the generation of compression wave was observed ahead of the train in the from of plane wave and the high pressure in the gap between the train.
李鳳來,陳元宰 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-
Conventional aerodynamic simulations have carried out over a hundred grid point or wind tunnel experiment by using Supercomputer. It takes s long time to get a result. This paper has dealt on flow characteristics of automobile in the flow field. CFD(Computational Fluid Dynamics) has been able to apply to the industrial field in these days. This new method has been applied to the aerodynamic simulation system, a designer has been able to carry out practically on early designing phase of automobile. This paper has been focused on the necessity of rear-spoiler, the peculiarity of aerodynamic drag, and the level of drive safety. A complex wake structure in the immediate rear of the car has been confirmed. The distributions of the surface pressure coefficient are not sensitively dependent on the Reynolds Number.
혼합 체적-경계 적분방정식법을 이용한 탄성해석 방법 개발
이정기,허강일,진원재,Lee, Jeong-Gi,Heo, Gang-Il,Jin, Won-Jae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
A Mixed Volume and Boundary Integral Equation Method is applied for the effective analysis of elastic wave scattering problems and plane elastostatic problems in unbounded solids containing general anisotropic inclusions and voids or isotropic inclusions. It should be noted that this newly developed numerical method does not require the Green's function for anisotropic inclusions to solve this class of problems since only Green's function for the unbounded isotropic matrix is involved in their formulation for the analysis. This new method can also be applied to general two-dimensional elastodynamic and elastostatic problems with arbitrary shapes and number of anisotropic inclusions and voids or isotropic inclusions. In the formulation of this method, the continuity condition at each interface is automatically satisfied, and in contrast to finite element methods, where the full domain needs to be discretized, this method requires discretization of the inclusions only. Finally, this method takes full advantage of the pre- and post-processing capabilities developed in FEM and BIEM. Through the analysis of plane elastostatic problems in unbounded isotropic matrix with orthotropic inclusions and voids or isotropic inclusions, and the analysis of plane wave scattering problems in unbounded isotropic matrix with isotropic inclusions and voids, it will be established that this new method is very accurate and effective for solving plane wave scattering problems and plane elastic problems in unbounded solids containing general anisotropic inclusions and voids/cracks or isotropic inclusions.